LK4mini I²C + I²C/1-Wire

LK4mini is the answer to the need for remote reading and storing of data from digital sensors on a server.

The device features a built-in web server (like LK4) for viewing readings and configuring settings using a browser. It is available in two versions: with two I²C buses or I²C and RS485 with Modbus RTU support.

Key features:

• Two I²C buses for connecting sensors through RJ12 connectors: the outer connector only for AM2301B temperature and humidity sensors, and the middle one supporting a range of I²C sensors (list below) as well as DS18B20 on a 1-Wire bus,
• 10/100 Mb Ethernet communication with PoE 802.3af power,
• Optional 5 V power supply and 2.4 GHz WiFi wireless transmission,
• Management via a web interface.

Main interface functionalities accessible via the web page:

• Viewing sensor data in the admin or user window with a customizable dashboard layout,
• Event configuration,
• Scheduler-based action configuration,
• OLED display configuration,
• MQTT, HTTP client, and SNMP protocol configuration,
• Email notification setup,
• Access management, firmware upgrades,
• Setting local or network time (NTP).

Sensors supported by the I²C bus:

• BME280 (humidity, temperature, atmospheric pressure)
• AM2301B, AHT20, AHT25, AM2320, HTS221 (humidity, temperature)
• SPS30, APM10 (particulate matter sensor: PM1, PM2.5, PM4, PM10)
• SCD40, ACD10 (CO2 level sensor)
• 0.96-inch OLED display

Technical specifications:

• Power supply voltage: 8÷58 V
• Power consumption: 0.5W
• PoE power: YES (802.3af) mode A, passive mode B with jumper
• Interfaces: I²C, I²C/1-Wire, Ethernet 10/100 Mbit/s, Wi-Fi 802.11n
• Operating temperature range: —20 to +85 °C
• Dimensions: 60 x 58 x 16 mm
• Weight: 25 g
• DIN rail mounting: Yes (35 mm)

Downloads:

• Product card